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listener error - connections failing or are slow

Oracle 10g; Windows 2003 server

This server/db is about 2 weeks old. It was working fine but now the connection to db are getting real slow or they are failing most of the times. The error it shows are:
TNS-12571: TNSacket writer failure
TNS-12560: TNSrotocol adapter error
TNS-00530: Protocol adapter error
32-bit Windows Error: 54: Unknown error
TNS-12500: TNS:listener failed to start a dedicated server process

Memory is not the issue. There is plenty. The difference that I noticed between this server/db and other working servers/db is that they are not MTS setup but this one is has these entries in registry.